I tryed all that was suggested while it was suggested, it might be that the file system is behond recovery as even if I edit the card.img suggested by Nelz using khexedit suggested by towy71, I cannot find the directory with the corrupted name
the only error messages that I get while accessing the card after mounting /dev/sda1 is that the file does not exist, escaping the ? does not work (as I indicate in a previous reply)

I am very gratful for the help and suggestion, it hopened some other possibilities.

but... is there a software that can edit the filesystem (not the files) ? ))

I got them back. to my shame, I found in the package of the media reader a program for Windows called HAMA photorescue. to my shame because I would have preferd use Linux but thos was too important to me to pass a solution. so I recover my photos even if I still cannot access the folder from a prompt or a filebrowser

Noth ing against any tool that gets the job done, I still have to use Windows for my laptop when I want wireless access cos the PCMCIA card I was given will not work in Linux, not even with ndiswrapper so there you go.
I do hope you have now formatted the card and no longer have the initial problem